It varied depending on who was participating and where it was being held.
For the most part gauges weren't allowed, this could include eye and throat to prevent maiming. Other then that there were few other rules. It was an all out fight intended to be used in combat to kill one's opponent. The Spartans were often banned from competition as they were trained in the fighting techniques since they were young.
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The pankreton was an event in the ancient Olympics. It was a combination of boxing and wrestling with few rules and could result in death.
The Pankration :)
If your referring to the Ancient Olympics then it was the Pankration. It was a blend of wrestling and boxing. Rules outlawed only biting and gouging an opponent's eyes, nose, or mouth with fingernails. Attacks such as kicking an opponent in the belly, which are against the rules in modern sports, were perfectly legal.
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Plato